Weighting apparatus for drafting rolls



g a 1955 F. KALWAITES WEIGHTING APPARATUS FOR DRAFTING ROLLS Filed April14, 1954 s Shets-Sheet 1 I N V EN TOR.

FRANK KALWAITES AT TX April 1955 F. KALWAITES WEIGHTING APPARATUS FORDRAFTING ROLLS Filed April 14. 1954 3 Sheets-Sheet 2 E .n RA mm A VK mKN A R .r

April 1955 F. KALWAITES WEIGHTING APPARATUS FOR DRAFTING ROLLS FiledApril 14. 1954 3 Sheets-Sheet 3 INVENTOR FRANK KALWAITES A T'Y.

United States Patent WEIGHTING APPARATUS FOR DRAFTING ROLLS FrankKalwaites, Grafton, Mass., assignor to Whitin Machine Works,Whitinsville, Mass., a corporation of Massachusetts Application April14, 1954, Serial No. 423,010

7 Claims. (Cl. 19-135) This invention relates to the application ofpressure to the top rolls of a textile drawing frame.

It is the general object of my invention to provide improved apparatusfor simultaneously weighting a set of front, middle and back top rollsand for conveniently releasing the pressure thereon when so desired.

A further object is to provide weighting apparatus which is easilyadaptable to changes in the transverse spacing of the drafting rolls. Ialso provide a construction by which an increase in the transversespacing of the front and back rolls automatically increases the relativepressure on the front rolls.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of the invention is shown in the draw ings, in whichFig. 1 is a side elevation of a portion of a drawing frame embodying myimproved weighting apparatus;

Fig. 2 is a sectional side elevation of the parts shown in Fig. l but ina slightly different adjustment;

Fig. 3 is an enlarged detail sectional side elevation of apressure-applying construction;

Fig. 4 is an enlarged sectional side elevation, taken along the line 44in Fig. 8 and showing the provision for both vertical and horizontaladjustment of the main lever pivot;

Fig. 5 is an enlarged sectional side elevation of a release lever andcertain associated saddle members;

Fig. 6 is a detail sectional elevation, taken along the line 66 in Fig.5;

Fig. 7 is a detail sectional elevation, taken along the line 77 in Fig.2;

Fig. 8 is a detail sectional rear elevation, taken along the line 8-8 inFig. 4; and

Fig. 9 is a partial transverse sectional rear elevation, taken along theline 99 in Fig. 3.

Referring to Figs. 1 and 2, I have shown a portion of a drawing frame Fon which a longitudinal series of fixed brackets B are mounted. I havealso shown a pair of front rolls 10 and 11, middle rolls 12 and 14, and

back rolls and 16.

The front bottom roll 10 is continuously rotated in fixed bearing blocks(not shown), and the front roll 11 is mounted for free frictionalrotation by the bottom roll 10. The middle bottom roll 12 and the backbottom roll 15 are continuously rotated in bearings which may betransversely adjusted on supports carried by the frame F.

The middle top roll 14 is preferably driven by gears 17 and 18 from themiddle bottom roll 12, as shown in Fig. 2, and is held in desiredrelation to the bottom roll by a gear cover and easing member 20,vertically slidable in a support 21.

The support 21 (Fig. 7) is secured by a screw 22 to a rectangular crossbar 23, normally held in fixed position but adjustable to vary thetransverse location of the middle rolls. The middle rolls 12 and 14 arecommonly provided with long-draft aprons 24 and 25 as indicated in Fi 1.

in of the parts thus far described may be of conventional constructionand are not specifically claimed herein.

I will now describe the improved apparatus which I have provided forweighting or applying pressure to the top rolls 11, 14 and 16.

For this purpose, a main lever (Fig. l) is pivoted at 31 (Fig. 4) in acasing 32 which may be secured in forward or rearward adjustment on oneof the brackets ice B previously described. The lever 30 is preferablyof slotted rectangular tubular construction, and the pivot 31 comprisesa stud extending through the body portion 34 (Fig. 8) of a rod havingthreaded portions 35 and 35a at its ends.

Nuts 36 and 37 may be adjusted to raise or lower the pivot stud 31relative to the casing 32. The lower threaded portion 35a extendsthrough a backing 38 which is to be inserted in a selected hole 39 inthe bracket B. By tightening the nut 37, the casing 32 may be locked tothe bracket B in a desired horizontal position.

An arm 40 (Fig. 3) is pivoted at 41 on a block 42 which is slidable inthe slotted tubular main lever 30 and which is provided with a cross pin43 and with a clamping screw 44. By applying pressure by turning thescrew 44, the pivot stud 41 and cross pin 43 may be actuated to clampthe member 42 to the lever 30.

The arm 40 embraces the main lever 30 as shown in Fig. 9, and isprovided with an elongated stud 50, extending upwardly through arelatively heavy coil spring 52 and through an open cylinder 54 fixed tothe lower end of an upwardly-extending back link 55 (Fig. 1).

At its upper end, the spring 52 (Fig. 3) is enclosed in a shell 57secured to the rod by a washer 58. The shell 57 is slidable within theopen cylinder 54, and the spring 52 normally seats the lower end of thecylinder 54 firmly on the upper surface of the arm 40, which constitutesthe locating base for the cylinder 54 and for the lower end of the backlink 55. The middle portion of the link (Fig. 2) is slotted at 60 toembrace a fixed rod 61 by which sliding upward and downward movement ofthe link is directed.

At its upper end, the link 55 is connected by a pivot 62 (Figs. 2 and 5)to a release lever 64 having a bearing portion 65 '(Fig. 5) engaging theaxle or gudgeon 66 of the back top roll 16. A U-shaped spring clip 67associated with the bearing member 65 detachably retains the part 66 inthe release lever 64.

An outer saddle member 70 (Fig. 5) is also pivoted at 62 on the upperend of the back link 55 and is of U-shaped section, so that it mayenclose and telescope an inner saddle member 72. The lower edges 74 ofthe outer saddle member 70 embrace the inner saddle member 72 as shownin Fig. 7.

These two members may be secured in longitudinally adjusted telescopedposition by tightening a screw 75 (Fig. 5) having a threaded bearing inthe front end of the outer member 70 and engaging a plate 76 resting onthe top surface of the inner member 72. When the screw 75 is tightened,the members 70 and 72 act as a single unit.

A saddle bar 77 (Fig. 5) is connected to the inner saddle member 72 by apivot stud 78 and has an elongated or tail portion 79 extending rearwardinside of the member 72 and engaging the upper end of the gear cover orcasing member 20.

An elongated front link 80 (Figs. 2 and 5) is pivoted at its lower endat 81 to the front or short end of the lever 30. At its upper end, it isprovided with a hook 82 which engages the stud 78 which connects thefront end of the saddle member 72 to the saddle bar 77.

With these connections, it will be seen that the heavy spring 52 actsthrough the rod 50 and link 55 to pull the members 64, 70 and 72downward. At the same time, the spring 52 tends to raise the long end ofthe lever 30 and to shift the pivot stud 81 at the short end of thelever 30 downward, thus applying a relatively heavier downward pull tothe hook link 80.

As the hook link 80 transmits this downward pull to the cross pin 78 andsaddle bar 77, the major part of this down-pull is applied to the fronttop roll 11, but a minimum portion is simultaneously applied through thearm or tail 79 and the casing 20 to the middle top roll 14.

When it is desired to relieve pressure on the top rolls to permitremoval thereof or for any other purpose, the release lever 64 is swungupward about its pivot 62 to the position shown in broken lines in Fig.2.

Such upward movement of the lever 64 swings the back top roll 16 forwardand upward as also indicated in Fig. 2, and thus permits the back link55 to move downward and relieve the effective pressure of the spring 52.This downward movement of the back link 55 also permits the short frontend portion of the lever 30 to move upward and to thus relieve thepressure of the hook 82 at the upper end of the front link 80 on thecross pin 78.

The link 80 can then be swung backward or clockwise to clear the pin 78,after which the entire saddle structure comprising the parts 70, 72 and77 may be swung upward about the pivot 62 to a raised position in whichthe back top roll 16 and the front top roll 11 may be removed forcleaning or replacement if desired.

If it is not desired to'remove the top rolls from the saddle structure,the spring-holding clips as 67 and 670 (Fig. 5) will retain the rolls intheir bearing structures.

The front link 80 may have an offset lower end portion 80a (Fig. 4)which will engage the upper inner surface of the lever 30 and thus limitforward displacement of the link 80 when the saddle structure is raised.

If the relative spacing of the back rolls 15 and 16 from the front rollsand 11 is changed, the block 42 is to be correspondingly shifted alongthe main lever 30. It will be noted that Fig. 2 shows the parts arrangedfor greater spacing than is shown in Fig. l.

The forward-and-back position of the middle rolls 12 and 14 may bechanged by adjusting the cross bar 23 forward or rearward by anysuitable adjusting mechanism not shown herein.

It will further be noted that if the spacing between the front and backrolls is increased, the spring 52 acts on the lever 30 to greatermechanical advantage, and thus the relative pressure on the front toproll 11 is increased for wider roll spacing, which is a desired effect.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

l. A top roll weighting apparatus for a drawing frame comprising acompound saddle structure effective to apply pressure to a set of frontand back top rolls, a main lever mounted to swing in a vertical planeabout a fixed pivot intermediate its ends, a back link having ayieldable spring connection to the back end of said lever, means topivotally connect said back link to the rear end of said saddlestructure, and a detachable connection from the opposite and front endof said main lever to the front end of the saddle structure.

2. A top roll weighting apparatus as set forth in claim 1, in whichmeans is provided to change the effective operating ratio of said mainlever.

3. A top roll weighting apparatus as set forth in claim 1, in whichmeans is provided to change the operative length of the saddle structurebetween the points at which pressure is applied thereto.

4. A top roll weighting apparatus as set forth in claim 1, in which thesaddle structure comprises telescoping parts, one of which engages theback top roll and the other of which extends adjacent to and isassociated with the front top roll.

5. A top roll weighting apparatus as set forth in claim 1, in which thesaddle structure is connected to the back link by an intermediaterelease lever.

6. A top roll weighting apparatus as set forth in claim 1, in which afront link detachably connects the front and shorter end of said mainlever to the front end of the saddle structure and is convenientlydetachable therefrom.

7. A top roll weighting apparatus as set forth in claim 1, in which amiddle top roll is provided and in which a saddle bar is pivotallymounted in said saddle structure and applies pressure to the front andmiddle top rolls when tension is applied to said saddle structure.

References Cited in the file of this patent UNITED STATES PATENTS

